第五期_2020_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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第五期

机制砂颗粒形状对砂浆流变性能的影响研究

周新文1,2，刘建忠2,3，刘光严3，刘加平1,2

2020年第5期

摘要

引用本文

摘要：为研究机制砂颗粒形状对砂浆流变性能的影响，使用数字图像处理技术（DIP）对砂颗粒形状进行了定量表征，设计试验测量了砂浆流变曲线并计算了砂浆屈服应力与表观黏度。结果表明，机制砂的长宽比（E）、宽高比（F）比天然河砂分别大14%、18%，说明机制砂棒状和片状程度高于天然河砂；砂浆流变曲线反映出砂颗粒形状不规则会导致砂浆流动阻力增大，在高体积分数下更为显著；根据Chateau模型拟合40%体积分数机制砂砂浆屈服应力是天然河砂的1.5倍；砂浆表观黏度分析发现，机制砂砂浆表观黏度大于天然河砂，在低剪切速率下尤其明显。Abstract:Tostudytheeffectsofmanufacturedsandshapeonmortarrheologyproperty,thedigitalimageprocessing(DIP)methodwasusedtocharacterizesandparticleshapequantitatively,testsofmortarrheologycurvewereperformedanditsyieldstresswascalculatedbyrheologytest.ResultsshowthatEofmanufacturedsand(MS3)is14%biggerthanthatofriversand(RS),FofMS2is18%biggerthanthatofRS,consequently,soparticleshapeofMSismoreelongateandflatthanthatofRS.Besides,rheologycurveresultsshowthattheirregularshapesandwillincreaseresistancewhenmortarflowing,andtheeffectbecomesmoresignificantwithsandvolumeincreasing.BasedonChateaumodel,it′spredictedthatfor40%sandvolumemortar,yieldstressofMS3is1.5timesasRSduetoitsirregularsandshapeofMS3.

周新文,刘建忠,刘光严,等.机制砂颗粒形状对砂浆流变性能的影响研究[J].混凝土与水泥制品,2020(5):1-5. ZHOU X W,LIU J Z,LIU G Y,et al.Study of the Effect of Manufactured Sand Particle Shape on Mortar Rheological Property[J].China Concrete and Cement Products,2020(5):1-5.

3D打印水泥基材料的建造性研究

章苏阳，蒋亚清，王玉，潘亭宏

2020年第5期

摘要

引用本文

摘要：通过塑性强度、静态屈服应力和跳桌流动度的经时变化试验，研究了纳米黏土与减水剂协同作用对3D打印水泥基材料（3DPC）建造性的影响，并以流变性能为参考依据，建立了3DPC建造性的评价指标。结果表明，复掺纳米黏土和增黏型聚羧酸减水剂的3DPC经时塑性强度和经时静态屈服应力均随纳米黏土掺量增加而提高，纳米黏土的适宜掺量为0.8%；当静态屈服应力时变速率为2.0～4.2Pa/s时，可实现3DPC的挤出性与建造性的协同；在可打印、可建造窗口时间内，3DPC的跳桌流动度为170～190mm。掺用纳米黏土和增黏型聚羧酸减水剂对3DPC的流变参数进行调控是提高3DPC建造性的有效途径。Abstract:Buildabilityisanimportantperformanceparameterof3Dprintingcementitiousmaterials(3DPC).Effectofnano-clayandviscositymodifyingpolycarboxylatesuperplasticizer(VPCE)onbuildabilityof3DPCwasinvestigatedbytestingtimedependentgreenstrength,staticyieldstressandflowtable.Indexesforevaluationthebuildabilityof3DPCwereestablishedbasedonthereferenceofrheologicalparameter.ExperimentalresultsshowthatbothgreenstrengthandstaticyieldstressofVPCEdispersed3DPCincreasewithincreaseofnano-claydosage,andthesuitabledosageofnano-clayis0.8%.Synergybetweenextruderabilityandbuildabilitycanberealizedwhenthestaticyieldstressretentionrateequals2.0～4.2Pa/s.Duringprintwindowtime,flowtablevalueof3DPCis170～190mm.Itisaneffectivewaytoimprovethebuildabilityof3DPCbyrheologymodifyingtechniquebasedonnano-clayandVPCE.

章苏阳,蒋亚清,王玉,等.3D打印水泥基材料的建造性研究[J].混凝土与水泥制品,2020(5):6-9. ZHANG S Y,JIANG Y Q,WANG Y,et al.Research on Buildability of 3D Printing Cementitious Materials[J].China Concrete and Cement Products,2020(5):6-9.

高抗蚀硅酸盐水泥提高混凝土抗渗性能机理研究

任雪梅1,2，宋家茂1,2 ，郝挺宇1,2

2020年第5期

摘要

引用本文

摘要：为探究高抗蚀硅酸盐水泥提高混凝土的抗渗性能机理，试验研究了普通硅酸盐水泥混凝土及特制高抗蚀硅酸盐水泥混凝土的抗压强度、氯离子扩散系数和直流阶跃电阻率。结果表明，高抗蚀硅酸盐水泥不是通过提高混凝土强度而主要是通过降低内部空隙率及减少连通性来实现混凝土抗渗性的提升。Abstract:Inordertoexplorethemechanismofhighcorrosionresistanceportlandcementtoimprovetheimpermeabilityofconcrete,thecompressivestrength,rapidchloridediffusioncoefficientanddirectcurrentstepinputresistivityofconcretewithordinarycementandhighcorrosionresistantcement(HCRC)werestudied.TheresultsshowthatHCRCcanimprovetheimpermeabilityofconcretenotbyimprovingthestrengthofconcrete,butmainlybyreducingtheinternalporosityandconnectivity.

任雪梅,宋家茂,郝挺宇.高抗蚀硅酸盐水泥提高混凝土抗渗性能机理研究[J].混凝土与水泥制品,2020(5):10-12. REN X M,SONG J M,HAO T Y.Investigation on Mechanism of Permeability of Concrete with High Corrosion Resistant Portland Cement[J].China Concrete and Cement Products,2020(5):10-12.

盐渍土环境下混凝土中SO<sub>4</sub><sup>2</sup><sup>-</sup>扩散性试验研究

盐渍土环境下混凝土中SO₄²^-扩散性试验研究

王岩峰1，景浩2，闫长旺3，孙伟2

2020年第5期

摘要

引用本文

摘要：为了研究西部盐渍土环境下混凝土中SO42-的扩散性，测试了在不同溶液、不同干湿循环龄期下，混凝土中不同深度的SO42-含量。采用Fick第二定律为基本模型，考虑SO42-与混凝土结合能力以及混凝土为非均匀介质的特性，对SO42-扩散系数进行了分析讨论。此外，基于XRD结果，分析了侵蚀过程中钙矾石的生长情况以解释说明钙矾石的生成对SO42-扩散性的影响。结果表明，Cl-可促进侵蚀前期SO42-的侵蚀速度；西部盐渍土环境下混凝土中SO42-的扩散系数与结合能力呈负相关关系，与侵蚀深度呈正相关关系；SO42-浓度越高，钙矾石生长越快，钙矾石膨胀作用会填充混凝土的既有裂缝，从而抑制SO42-扩散。Abstract:InordertostudythediffusionofsulfateionsinconcreteunderthesalinesoilenvironmentinwesternChina,thecontentofsulfateionsinconcreteatdifferentdepthsindifferentsolutionsandatdifferentwet-drycycleageswasdetermined.Ficksecondlawwasadoptedasthebasicmodel.Consideringtheabilityofsulfateionstobondwithconcreteandthecharacteristicsofconcreteasnon-uniformmedium,thediffusioncoefficientofsulfateionswasanalyzedanddiscussed.Atthesametime,ettringitecrystalstructurewasrefinedaccordingtotheX-raydiffractionresultsofconcretesamplesaftererosion,andthegrowthofettringiteduringerosionwasanalyzed,soastoexplaintheinfluenceofettringitegenerationonthediffusionofsulfateions.Theresultsshowthatchlorideioncanpromotetheerosionrateofsulfateionintheearlystageoferosion.ThereisanegativecorrelationbetweenthediffusioncoefficientandbindingcapacityofsulfateionsinthesalinesoilofwesternChina,andapositivecorrelationbetweenitandthedepthoferosion.Thehighertheconcentrationofsulfateions,thefasterthegrowthofettringite.Theexpansionofettringitewillfilltheexistingcracksofconcretetoinhibitethediffusionofsulfate.

王岩峰,景浩,闫长旺,等.盐渍土环境下混凝土中SO42-扩散性试验研究[J].混凝土与水泥制品,2020(5):13-17,24. WANG Y F,JING H,YAN C W,et al.Study on the Diffusion of Sulfate Ions in Concrete Under the Saline Soil Environment[J].China Concrete and Cement Products,2020(5):13-17,24.

大面积板梁结构用补偿收缩混凝土的配制

阎培渝1，陈炜一1，赵海涛2，王海龙3，华东旗2，李习硕2，漆志祥2，康凯2

2020年第5期

摘要

引用本文

摘要：为满足大型电子工业厂房大面积楼板梁结构施工的抗裂性能要求，对比研究了HCSA膨胀剂及复合膨胀剂（MgO膨胀剂与HCSA膨胀剂复掺）的性能，并配制了高抗裂性的补偿收缩混凝土。试验结果表明，两种膨胀剂配制的C40补偿收缩混凝土都具有补偿收缩、防止开裂的效果。掺加复合膨胀剂的补偿收缩混凝土早期强度稍低，温升小，但补偿收缩能力较强，有利于改善大体积深梁与薄板同时浇筑的混凝土结构的抗裂性。Abstract:Theperformanceofdifferentkindsofexpansiveagentwasstudiedforthepreparationofshrinkage-compensatingconcretewithexcellentanti-crackingabilitytosatisfytheconstructingrequirementoflarge-scalebeamandslabstructureofelectronicplant.ThecomparingresultsofusingHCSAexpansiveagentaloneandcomplexlyusingHCSAexpansiveagentandMgOexpansiveagenttogethershowthattheshrinkage-compensatingconcretepreparedwithbothtwokindsofexpansiveagentpossessesanti-crackingability.Theconcretepreparedwithcomplexexpansiveagenthasalittlelowearlystrength,lowtemperaturerisingandstrongshrinkage-compensatingability.Itbenefitstheincreaseofanti-crackingabilityfortheconcretestructureinwhichthelargevolumedeepbeamandthinplateiscastsimultaneously.

阎培渝,陈炜一,赵海涛,等.大面积板梁结构用补偿收缩混凝土的配制[J].混凝土与水泥制品,2020(5):18-20,24. YAN P Y,CHEN W Y,ZHAO H T,et al.The Preparation of Shrinkage-Compensating Concrete for the Construction of Largescale Beam and Slab Structure[J].China Concrete and Cement Products,2020(5):18-20,24.

本体聚合固体聚羧酸系保坍剂的工业化制备及性能研究

陈国新1,2,3,4，祝烨然1,2,3,4，杜志芹1,2,3,4，温金保1,2,3,4

2020年第5期

摘要

引用本文

摘要：选用复合引发剂调节反应活化能，以异戊烯醇聚氧乙烯醚（TPEG）、丙烯酸（AA）、马来酸酐（MAH）为主要原料，通过工艺调整及工业化设备选型制备了本体聚合固体聚羧酸系保坍剂PC-702S2。通过GPC研究了工业化条件下保坍剂的转化率、分子量及分子多分散性（PDI），并基于红外光谱测试结果讨论了PC-702S2保坍剂的结构特征。研究结果表明，PC-702S2的转化率为94.43%，PDI为1.283，达到常规水溶液聚合保坍剂的性能，切片后的粒径范围≤300μm，适于工业化推广，具有良好的发展前景。Abstract:Byoptimizingcompositeinitiator,adjustingprocessandselectingindustrializedequipment,thesolidpolycarboxylateslump-retainingagentPC-702S2wasindustrialpreparedusingbulkpolymerizationwithTPEG,acrylicacidandmaleicanhydrideasmainrawmaterials.Thepolymerconversionrate,molecularweightandmolecularpolydispersity(PDI)wereanalyzedbyGPC,andthemolecularstructureofPC-702S2wasanalyzedbyinfraredspectroscopy.TheresultsshowthattheconversionrateofPC-702S2is94.43%,PDIis1.283,whichcanreachtheperformanceofconventionalaqueoussolutionpolymerizedslumpretainingagent.Theparticlesizeofsolidproductsisn’tmorethan300μm,whichissuitableforindustrializationandpromotion,andhasbigdevelopmentprospects.

陈国新,祝烨然,杜志芹,等.本体聚合固体聚羧酸系保坍剂的工业化制备及性能研究[J].混凝土与水泥制品,2020(5):21-24. CHEN G X,ZHU Y R,DU Z Q,et al.The Industrial Preparation and Properties of Solid Polycarboxylate Slump Retaining Agent Using the Method of Bulk-polymerization[J].China Concrete and Cement Products,2020(5):21-24.

预拌混凝土行业用水现状分析

管辰1，周继恒1，魏建勋1，胡志颖1，师海霞2，王建华3，颜小波1，贾嘉2，袁俁铖1

2020年第5期

摘要

引用本文

摘要：通过数据调研、实地走访等方式研究了我国预拌混凝土行业用水情况，并基于水平衡测试结果分析了各生产环节的耗水情况，为开展预拌混凝土行业用水研究以及制定相关标准工作提供参考。 Abstract: Based on data investigation, field visit, etc., water used in ready-mixed concrete industry was analyzed. Combining results of water balance testing, water consumption studies were made through each producing process. With such analysis and studies, foundations were built for further researches in water intake, norms of water intake and standards of water saving enterprises in ready-mixed concrete industry.

管辰,周继恒,魏建勋,等.预拌混凝土行业用水现状分析[J].混凝土与水泥制品,2020(5):25-27. GUAN C,ZHOU J H,WEI J X,et al.Status Analysis of Water Intake in Ready-mixed Concrete Industry[J].China Concrete and Cement Products,2020(5):25-27.

管芯纵向裂缝对BCCP承载能力影响研究

孙岳阳1，胡少伟1,2，明攀1，薛翔2

2020年第5期

摘要

引用本文

摘要：为了研究管芯纵向裂缝对BCCP（钢筋缠绕钢筒混凝土压力管）承受内、外压能力的影响，选取合适的材料本构模型，利用ABAQUS软件建立了DN1 800 BCCP内、外压计算模型，在内压管的钢筒外管芯和外压管的管顶钢筒内管芯处分别设置了1 000 mm、2 000 mm、3 000 mm、4 000 mm的纵向裂缝，将计算结果与完好管进行了对比。结果表明，对于内压管，外管芯纵向裂缝仅对外管芯达到受拉极限所对应的内压值产生影响，且该值与纵向裂缝长度无关，均在2.95 MPa左右，比完好管小0.25 MPa；对于外压管，管顶内管芯纵向裂缝仅对裂缝所在位置处达到受拉极限所对应的外压值产生影响，同样与纵向裂缝长度无关，均在1 200 kN左右，比完好管小300 kN；无论是内压管还是外压管，保护层、钢筒和钢筋达到极限强度时所对应的荷载值都与管芯有无裂缝以及裂缝长度无关。 Abstract: In order to study the effect of longitudinal crack on the capacity of BCCP under internal or external pressure, the finite element software ABAQUS was used to establish two calculation models with the same diameter of 1 800 mm and appropriate material constitutions were selected. The longitudinal cracks of 1 000 mm, 2 000 mm, 3 000 mm and 4 000 mm in length were arranged in the outer core of BCCP under internal pressure and in the top of the inner core under external pressure. The calculated results were compared with those of the intact pipe. The results show that for the pipe under internal pressure, the longitudinal crack of the outer core only affects the pressure corresponding to the tensile limit of the outer core, and this value is independent of the crack length, which is about 2.95 MPa, and is 0.25 MPa smaller than that of the intact pipe. For the pipe under external pressure, the longitudinal crack in the top of the inner core only affects the pressure corresponding to the tensile limit at the location of the crack, which is also independent of the crack length. The calculation results of loads are all around 1 200 kN, which is 300 kN smaller than that of the intact pipe. Whether BCCP is under internal or external pressure, the loads corresponding to the protective cover, cylinder and steel bar when they reach the ultimate strength are independent of the cracks in core and length of cracks.

孙岳阳,胡少伟,明攀,等.管芯纵向裂缝对BCCP承载能力影响研究[J].混凝土与水泥制品,2020(5):28-33. SUN Y Y, HU S W,MING P,et al.Study on the Effect of Longitudinal Crack in Core Pipe on the Bearing Capacity of BCCP[J].China Concrete and Cement Products,2020(5):28-33.

复合应力下PVA-ECC受扭柱的抗震性能试验研究

梁肖1，邵永健1，凌智1，王国佐2

2020年第5期

摘要

引用本文

摘要：通过6根钢筋加强ECC柱和1根普通混凝土柱在压-弯-剪-扭复合应力状态下抗震性能试验，研究了构件的滞回曲线、骨架曲线、强度退化、刚度退化以及破坏形态，分析了配箍率、纵筋配筋率、纤维掺量对ECC受扭柱抗震性能的影响。试验结果表明，较普通RC柱，ECC柱的滞回曲线更加饱满，屈服扭矩、极限扭矩以及极限扭率分别提高了64.4%、74.8%、123.3%；试件的纤维掺量从1%提高到2%，延性系数从2.30增至4.04；随着配箍率增大，试件受扭性能增强，较于未配置箍筋的试件，箍筋间距为75mm的试件延性系数提高了66.2%，极限扭矩提高了34.0%。Abstract:Basedontheseismicperformancetestof6ECCcolumnsstrengthenedwithsteelbarsandoneordinaryconcretecolumnundertheconditionofcompressionbendingsheartorsioncompositestress,thehystereticcurve,skeletoncurve,strengthdegradation,stiffnessdegradationandfailuremodeofthecomponentwerestudied,andtheinfluenceofstirrupratio,longitudinalreinforcementratioandfibercontentontheseismicperformanceofECCcolumnssubjectedtotorsionwasanalyzed.TheresultsshowthatthehystereticcurveofECCcolumnisfullerthanthatofordinaryRCcolumn,andtheyieldtorque,ultimatetorqueandlimittorsionrateareincreasedby64.4%,74.8%and123.3%respectively.Thefibercontentincreasesfrom1%to2%,theductilitycoefficientincreasesfrom2.30to4.04.Withtheincreaseofstirrupratio,thetorsionalperformanceofspecimenisenhanced.Comparedwiththespecimenwithoutstirrup,theductilitycoefficientandultimatetorqueofspecimenwithstirrupspacingof75mmareincreasedby66.2%and34.0%respectively.

梁肖,邵永健,凌,智,等.复合应力下PVA-ECC受扭柱的抗震性能试验研究[J].混凝土与水泥制品,2020(5):34-37. LIANG X,SHAO Y J,LING Z,et al.Experimental Study on Seismic Behavior of PVA-ECC Columns under Composite Stress[J].China Concrete and Cement Products,2020(5):34-37.

海洋腐蚀环境下钢筋混凝土梁疲劳试验研究

张秋悦1，王晖1，韩文臣2

2020年第5期

摘要

引用本文

摘要：对8根钢筋混凝土梁进行了大气环境、淡水及海水环境下的疲劳试验，研究了其力学性能及刚度损伤演化规律。进一步分析了三种环境与循环荷载共同作用下试件梁的破坏形态、挠度发展规律和疲劳寿命。试验结果表明，腐蚀和疲劳存在耦合作用，海水腐蚀环境与5%～70%荷载水平作用下，梁疲劳寿命最短。根据理论分析和试验结果，对钢筋混凝土梁在严酷海洋环境下的疲劳寿命及其规律进行了进一步研究，参考已有文献和试验研究结果给出了基于钢筋混凝土梁刚度损伤演化规律的疲劳寿命预测模型，经计算，实测结果与该预测模型计算结果之间的误差不超过13%。Abstract:Thefatiguetestsofeightreinforcedconcretebeamsunderatmospheric,freshwaterandseawaterconditionswerecarriedouttostudythemechanicalpropertiesandstiffnessdamageevolutionofreinforcedconcretebeams.Furtheranalyzethefailuremode,deflectiondevelopmentlawandfatiguelifeofthespecimenbeamundertheinteractionofthreeenvironmentsandcyclicloads.Thetestresultsshowthatthereiscouplingbetweencorrosionandfatigue.Undertheactionofseawatercorrosionenvironmentand5%～70%loadlevel,thefatiguelifeofthebeamistheshortest.Accordingtothetheoreticalanalysisandexperimentalresults,thefatiguelifeanditsregularityofreinforcedconcretebeamsunderseveremarineenvironmentarefurtherstudied.Referringtotheexistingliteratureandexperimentalresearchresults,thefatiguelifepredictionmodelbasedonthestiffnessdamageevolutionlawofreinforcedconcretebeamsisgiven.Aftercalculation,theerrorbetweenthemeasuredresultsandthecalculatedresultsofthepredictivemodeldoesnotexceed13%.

张秋悦,王晖,韩文臣.海洋腐蚀环境下钢筋混凝土梁疲劳试验研究[J].混凝土与水泥制品,2020(5):38-41. ZHANG Q Y,WANG H, HAN W C.Experimental Study on Fatigue Behavior of Reinforced Concrete Beams under Marine Corrosion Environment[J].China Concrete and Cement Products,2020(5):38-41.

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